Wind turbines and solar photovoltaic power plants endanger stability of the electricity transmission grid. Technology of storage of the produced energy is required – hydrogen economy offers a solution:. Hydrogen is produced in electrolysers, then it is stored, and when necessary hydrogen is combusted in fuel cells to produce electricity.Further information about research in the Department of polymeric membranes: http://www.imc.cas.cz/en/umch/o_membr.htm